/*
 * Copyright 2006 Jerry Huxtable
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alee.graphics.filters;

/**
 * @author Jerry Huxtable
 */
public class RGBAdjustFilter extends PointFilter
{
    public float rFactor;
    public float gFactor;
    public float bFactor;

    public RGBAdjustFilter ()
    {
        this ( 0, 0, 0 );
    }

    public RGBAdjustFilter ( final float r, final float g, final float b )
    {
        rFactor = 1 + r;
        gFactor = 1 + g;
        bFactor = 1 + b;
        canFilterIndexColorModel = true;
    }

    public void setRFactor ( final float rFactor )
    {
        this.rFactor = 1 + rFactor;
    }

    public float getRFactor ()
    {
        return rFactor - 1;
    }

    public void setGFactor ( final float gFactor )
    {
        this.gFactor = 1 + gFactor;
    }

    public float getGFactor ()
    {
        return gFactor - 1;
    }

    public void setBFactor ( final float bFactor )
    {
        this.bFactor = 1 + bFactor;
    }

    public float getBFactor ()
    {
        return bFactor - 1;
    }

    public int[] getLUT ()
    {
        final int[] lut = new int[ 256 ];
        for ( int i = 0; i < 256; i++ )
        {
            lut[ i ] = filterRGB ( 0, 0, ( i << 24 ) | ( i << 16 ) | ( i << 8 ) | i );
        }
        return lut;
    }

    @Override
    public int filterRGB ( final int x, final int y, final int rgb )
    {
        final int a = rgb & 0xff000000;
        int r = ( rgb >> 16 ) & 0xff;
        int g = ( rgb >> 8 ) & 0xff;
        int b = rgb & 0xff;
        r = PixelUtils.clamp ( ( int ) ( r * rFactor ) );
        g = PixelUtils.clamp ( ( int ) ( g * gFactor ) );
        b = PixelUtils.clamp ( ( int ) ( b * bFactor ) );
        return a | ( r << 16 ) | ( g << 8 ) | b;
    }

    @Override
    public String toString ()
    {
        return "Colors/Adjust RGB...";
    }
}